Return the default argument.
This needs to be overridden by every default argument handler to properly do what is needed.
Overrides ArgumentDefaultPluginBase::get_argument
function get_argument() {
// set up variables to make it easier to reference during the argument.
$view =& $this->view;
$argument =& $this->argument;
ob_start();
$result = eval($this->options['code']);
ob_end_clean();
return $result;
}